Fix KNPE in KotlinAddImportActionKt.createSingleImportActionForConstructor

#KT-17525 fixed

idea/testData/quickfix/autoImports/kt17525.kt

@@ -0,0 +1,11 @@
+// "class org.jetbrains.kotlin.idea.quickfix.ImportConstructorReferenceFix" "false"
+// ERROR: Unresolved reference: ItsInner
+
+
+class WithInner {
+    inner class ItsInner
+}
+
+fun referInner(p: WithInner.ItsInner) {
+    val v = p::ItsInner<caret>()
+}